single-ply bellows

例句：

1. 1. The engineer used a single-ply bellows to adjustthe air pressure in the engine.
   工程师使用单层波纹管来调整发动机中的空气压力。
2. 2. The construction workers used single-ply bellows to blowsand into the cracks in the concrete.
   建筑工人使用单层波纹管将沙子吹入混凝土裂缝中。
3. 3. Thefarmer used a single-ply bellows to pump water from the well.
   农民使用单层波纹管从井中抽水。